Window-sash supporter



FFICE,

IVILLIAM IIOVARD MITCHELL, OF SAN FRANCISCO, CALIFORNIA.

WINDOW-SASH SUPPORTER.

Specification of Letters Patent No. 25,666, dated October 4, 1859.

To all whom it may concern:

Be it known that I, lVrLLIAM HOWARD MITCHELL, of the city and county ofSan Francisco and State of California, have invented a new and usefulApparatus for Locking, Hoisting, and Holding `Window Sashes, which Icall Mitchells Vindow Lock, I-Ioister, and Holder; and I do herebydeclare that the following is a full, clear, and exact description ofthe. construction and operation of the same, reference being had to theaccompanying drawings, making a part of this specification, in which-Figure l, is a perspective view; Figs. 2 and 8 showing the method ofapplying the same to the window; and Fig. t, showing the top side of thejointed arm.

The'nature of my invention consists 1st in the combination of a frictionroller, double jointed arm, self adjusting spiral spring and stationarystop.

It consists 2nd: In the combination of the above with a semicircularrecess in the window frame.

The arrangement and operation of the parts included in the first clauseof the statement of the nature of my invention are very peculiar andadvantageous, to wit:

lst. When the parts have been properly adjusted and the window is beingraised, the spring acts upon the friction roller in such a manner thatsaid roller receives the weight of the sash, partly balances the sameand thus the labor of elevating the sash is very materially lessened.

2nd. `When the window-sash is fully hoisted, if it is not too heavy, theforce of the spring upon the friction roller and the friction of thelatter on the frame will retain the sash, but should the weight of thesash be too great, provision is made for a slight descent of the sameand as this descent is occurring the roller is elevated in such a mannerthat the tension of the springy is increased, and now if the weight isstill too great, the roller rises still higher as the sash descends andsuddenly gears with a stationary stop and all further descent of thesash prevented.

The combination included in the second clause of the statement of thenature of my invention is also novel, for the same friction roller whichis used for assisting in the elevation and the retention of the sashafter it is elevated is also made to answer as a lock or permanentfastening for holding the spring, in such a manner as to renderimpossible the raising of the sash without first withdrawing the rollerwith the hand.

D, is an .L shaped plate to be fastened to the top of a sash, N, or maybe let into a sash; A, is a friction roller attached to a double jointedarm B, B; C, O, are hinge joints of the arm B, B; the plate D terminatesin a curved end E; the arm B, B, has a slot as represented in Fig. 4f,to receive the pulley or friction roller A, and also being passed overthe end E, serves as a guide to keep the arm in place.

Then the window is closed the spiral spring F, draws the arm B, forwardso that the roller A, rests in a small recess m, in the side of thewindow frame as represented in Fig. 2, and the arm B, drops upon theshoulder Gr, securely locking the window sash; to raise the window drawback the arm B, by the thumb piece I-I, raising it above the recess, andhoist the window with the hand; the pressure of the roller, by means ofthe spring F, against the side of the window frame, counteracts much theweight of the sash, thereby assisting in the hoisting of the same; whenthe sash is raised to the desired position the pressure of the rolleragainst the window frame will keep it in place, should the weight of thesash be too great it may fall a little, but in so doing the' rollerwould be raised till it reaches the point E, increasing the angle of thearm at I, and consequently giving greater tension to the spring Fcausing the roller to press more closely against the window frame,should the weight still be too great the roller will slip against theplate and be effectually locked by the curved end E, and the sash befully sustained at the desired point.

I do not claim the roller A, pressing against the Vwindow frame, for thepurpose of sustaining the sash, as that has been heretofore in use.

Vhat I claim as my invention and desire to secure by Letters Patent, is-

l. The roller A arranged on an angular double jointed arm B, B, C, C, soas to have recess m, in the Window frame, substantially as and for thepurposes set forth.

WM. HOWARD MITCHELL.

Witnesses:

J. H. PEIRCE, EDWARD A. BREED.

